In the title compound, C15H17N3OS, the dihedral angle between the mean planes of the 2-hy-droxy-napthyl ring system and the hydrazinecarbo-thio-amide group is 73.7 (3)°. In the crystal, weak O-H⋯S and C-H⋯O inter-actions and π-π stacking inter-actions involving one of the hy-droxy-napthyl rings with a centroid-centroid distance of 3.6648 (14) Å are observed, forming infinite chains along [010]. In addition, N-H⋯S inter-actions occur.
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